2022 Topic 1 Revision

List three features that would be grouped in region C on the diagram. (pick 3 correct answers)

• cytoplasm & nucleus

• cell sap or large vacuole

• mitochondria

  vacuole

• cell membrane

State one feature, visible in the diagram, which shows that a root hair cell is a plant cell. (2 correct answers)

• cell wall

• large central vacuole

• nucleus

• cell membrane

State the relationship between the cell structure and cell function shown in the diagram. (3 correct answers)

• Have long cell extension for uptake mineral ions by

  active transport

• Have finger-like projections to

  increase surface area for absorption

• Have long cell extension for uptake of water by osmosis

• Have finger-like projections to

  reduce surface area for absorption

State the relationship between cell structure and cell function shown in the diagram. (3 correct answers)

• round and circular to easily absorb water and minerals

• biconcave in shape to

  increased surface area to carry

  oxygen by diffusion

• have no nucleus to

  increased space so that more

  haemoglobin

  can bind with oxygen to form oxyhaemoglobin

• flexible or elastic/ cna change shape and can squeeze ;

  into/ thorugh capillaries

Suggest and explain what symptoms might be experienced by a person with an unusually low number of this type of cell. (more than 1 correct answer)

• tiredness / fatigue / weak / dizzy / faint

• inability to exercise/inactive

• breathing problems ;

  reduced oxygen transport ;

• reduced energy / inactive

State the functions & features of root hair cell. (more than 1 correct answer)

• Has no chloroplast (does not trap light energy in soil)

• Has cell wall, cytoplasm, nucleus and cell membrane

• Absorb mineral ions (e.g. nitrates and magnesium) by active transport

• Absorbs water by osmosis

Define a cell membrane. (2 correct answers)

• is a partially permeable

  membrane

• is a fully permeable membrane

• allows all substances to pass through cell

• controls the passage of substances into and out of cells

State the function & features of cell wall. (more than 1 correct answer)

• maintaining turgor (turgidity) within the cell to help plant stand upright

• Is fully permeable allowing all substances to move in and out of cell

• Can only be found in plants cells

• Tough / flexible to

  help keep shape of cell

Pick the correct definition. (more than 1 correct answer)

• Cell is the basic unit of life

• Tissues are made up of cells with common/specific function

• Organs are made up of tissues

  working together

• Organ system is a group of cells working together

State the features and functions of chloroplast which are correct.

• Contains high amount of magnesium which is an important ion to make chlorophyll

• Contains chlorophyll which is the green pigment, not found in onion cell

• absorbs sunlight, site of photosynthesis,

  contains starch grain which is the storage form of glucose

• Turns blue-black when tested with iodine test